The problem: in affected vehicles, the front bearing hub assembly fasteners (the bolt that fastens the hub itself to the steering knuckle) may have been bent during the assembly process.
The hazards: while GM did not say what problems this may lead to, a bent front bearing/hub assembly fastener could cause the hub and/or steering knuckle to be improperly positioned.
The fix: dealers will be instructed to replace the front hub bolts on the left and/or right sides. This fix will require repair parts, including a front hub bolt and, for four-wheel-drive models only, a half shaft nut.
Affected components: front bearing hub assembly fastener.
- 2021 Chevy Silverado 2500HD
- 2021 Chevy Silverado 3500HD
- 2021 GMC Sierra 2500HD
- 2021 GMC Sierra 3500HD
Number of affected vehicles: a total of 44 trucks have this condition on the left-side suspension, while 29 have it on the right side. It is not clear if any vehicles show the condition on both sides, or if the problem affects 73 vehicles total between the left and right sides.
Owners should: owners can wait for GM to reach out to them to make an appointment with their dealership. This service update is for vehicles in dealership inventory and customer vehicles that return to the dealership for any reason in the future. Dealers and owners can reach out to Chevrolet or GMC directly using the contact information included below with any questions or concerns they may have. The service update was released in September 2021 and will expire at the end of the truck’s New Vehicle Limited Warranty Period.
- GM Service Update number: N212332830, N212332831
- Chevrolet Customer Service: 1-800-222-1020
- GMC Customer Service: 1-800-462-8782